e-Περιοδικό Επιστήμης & Τεχνολογίας

e-Journal of Science & Technology, (e-JST)



I. G. Valais1, P. C. Xydias2

1Department of Medical Instruments Technology, Technological Educational Institution of Athens, Ag. Spyridonos, Aigaleo, 122 10 Athens, Greece, e-mail: ivalais@teiath.gr

2Radiation Therapy Department, Iatropolis S.A., 56 Ethnikis Antistaseos str., 15231 Athens, Greece


Abstract. Despite the many advances in patient positioning, dose deliverance as intended remains a difficult practical issue due to a number of complicating factors.Various techniques and methods have been developed over the years for accurate patient positioning.It has long been recognized that the use of the therapy x-ray beam itself to create portal images can be of significant benefit in assuring correct delivery of the radiation dose. The present study is a brief overview of the detectors incorporated on electronic portal imaging devices imposed by the nature of the application and the physics of the imaging source. It is a summary of the challenges and constraints inherent to portal imaging along with a concise, historical review of the technologies that have been explored and developed. This is followed by a detailed description of a new, high performance, portal imaging technology, which is presently undergoing commercial introduction.